In a recent study called the COURAGE Trial (Clinical Outcomes Utilizing Revascularization and Aggressive Drug Evaluation) conducted in 50 hospital centers across the United States and Canada showed that optimal drug treatment with percutaneous coronary interventions (PCI) for stable coronary artery disease, was not more effective than optimal medical therapy alone for preventing cardiovascular events, hospitalization or death, suggesting that drugs, surgical procedures or both were not a statistically effective solution for CHD.